@squashsquash - I was able to find a 3rd party Wi-Fi dongle that works great (going for a week strong at the far end of my house opposite the router). it's available on amazon and cheap. though, it's super bulky. As I understand, the necessary compatibility requirement is the Qualcomm Atheros AR9271 chipset.
https://www.amazon.com/dp/B07FVRKCZJ
given that, there's another device that works as well, but equally bulky. TP-Link TL-WN722N (MUST BE version 1.x, higher versions use different chipset). There are some available on ebay, I don't know a great way to tell version by packaging / UPC alone..